<template>
 <view>
   <my-search @click="gotoSearch"></my-search>
  <view class="scrool-view-container">
     <!-- 左侧的滑动区域 -->
    <scroll-view class="left-view-container" scroll-y="true" :style="{ height:wh + 'px'}">
      <block v-for="(item,i) in catList" :key="i">
        
        <view :class="['left-scroll-view-item ',i === active ? 'active' : '']"  @click="activeChanged(i)">{{item.cat_name}}</view>
      </block>

    </scroll-view>
    <!-- 右侧的滑动区域 -->
    <scroll-view class="right-view-container" scroll-y="true" :style="{ height:wh + 'px'}" :scroll-top="scrollTop">
      <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
        <!-- 二级分类的标题 -->
        <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
        <!-- 当前二级分类下的三级分类-->
        <view class="cate-lv3-list">
          <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
            <!-- 三级分类的图片 -->
            <image :src="item3.cat_icon.replace('dev','web')" mode=""></image>
            <!-- 三级分类的文本 -->
            <text>{{item3.cat_name}}</text>
          </view>
        </view>
      </view>
    </scroll-view>
  </view>
</view>
</template>

<script>
  import badgeMix from '@/mixins/tabbar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        // 当前设备可用高度
        wh:0,
        catList:[],
        active:0,
        cateLevel2:[],
        scrollTop:0,
      };
    },
    onLoad() {
      const sysInfo =  uni.getSystemInfoSync();
      console.log(sysInfo);
      this.wh = sysInfo.windowHeight - 50;
      this.getcatList();
    },
    methods:{
      // 获取分类列表的数据
      async getcatList(){
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status !== 200) return uni.$showMsg()
        this.catList = res.message
        // 为二级分类赋值
        this.cateLevel2 = res.message[0].children
      },
      activeChanged(i){
        this.active = i
        
        // 重新为二级分类赋值
        this.cateLevel2 = this.catList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 0.1 : 0
      },
      // 跳转到商品列表页面
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scrool-view-container{
  display: flex;
  .left-view-container{
    width: 120px;
    .left-scroll-view-item{
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      
      &.active {
        background-color: #FFFFFF;
        position: relative;
        &::before{
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #C00000;
          position: absolute;
          top: 50%;
          left: 0;
          transform: translateY(-50% );
        }
      }
    }
  }
  
}

.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}



.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  .cate-lv3-item{
    width: 33.33%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    image {
      width: 60px;
      height: 60px;
    }
    text{
      font-size: 12px
    }
  }
}
</style>
